16400073605 has 4 divisors (see below), whose sum is σ = 19680088332. Its totient is φ = 13120058880.

The previous prime is 16400073593. The next prime is 16400073631. The reversal of 16400073605 is 50637000461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50637000461 = 20873 ⋅2425957.

It can be written as a sum of positive squares in 2 ways, for example, as 2851346404 + 13548727201 = 53398^2 + 116399^2 .

It is not a de Polignac number, because 16400073605 - 2⁴ = 16400073589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640007356 + ... + 1640007365.

It is an arithmetic number, because the mean of its divisors is an integer number (4920022083).

Almost surely, 2^16400073605 is an apocalyptic number.

It is an amenable number.

16400073605 is a deficient number, since it is larger than the sum of its proper divisors (3280014727).

16400073605 is an equidigital number, since it uses as much as digits as its factorization.

16400073605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280014726.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 16400073605 in words is "sixteen billion, four hundred million, seventy-three thousand, six hundred five".